no really special filters, just a resize. Resolution is maybe not the correct word ? I am always confused with resolution and size when talking about videos (and maybe because of a mistranslation of the french word: résolution). Don't hesitate to correct me, I will modify the post with the correct word: The video has the size of 704x528 (in term of number of pixels) => so must I talk about "resolution" or just "size" in this case ? I don't know.
I believe that the term "resolution" has always been too much ambiguous. When I think about the resolution of a display or a print I tend to think about its detail quality, which could be also understood as the number of pixels or points (depending on the media) per size unit (inch, centimeter, etc.). However, this way of thinking doesn't match the reality in computing, and many times that term is used to mean just a size. Conclusion? Use the term which you like more XD .